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Introduction to Spectroscopy

2023; Linguagem: Inglês

10.1201/9781003412588-1

1939-1900

Preeti Gupta, S. S. Das, N. B. Singh,

Spectroscopy and Chemometric Analyses

Spectroscopy may be defined as the study of the interaction of electromagnetic radiation with matter. During interaction absorption, emission or scattering of radiation may take place. The structure and chemical properties of the system can easily be understood and studied with the help of atomic and molecular spectroscopic techniques. The study of the exchange of energy between electromagnetic radiations with matter forms the basis of spectroscopy. Electromagnetic radiation may be considered as a simple harmonic wave propagating from a source and traveling in straight lines except when refracted or reflected. According to the frequency or wavelength of an electromagnetic wave, there are several regions into which the electromagnetic radiation can be divided. In the years 1927, Max Born and J. R. Oppenheimer proposed an assumption that the motion of atomic nuclei and electrons in a molecule can be quantum mechanically studied separately. This approach is called the Born–Oppenheimer approximation.